Self-releasing joist shoe and anchor.



PATENTED JUNE 14, 1904.

A..GARLs0N. SELF RELEASING JOIST SHOE, AND ANCHOR.

APPLICATION FILED NOV. 30 19 ll mTlll imlliillllll UNITED STATES Patented June 14, 1904.

PATENT OFFICE.

ALFRED CARLSON, CHICAGO, ILLINOIS, ASSIGNOR TO CHAS. MULVEY MFG. CO., A CORPORATION OF ILLINOIS.

SELF-RELEASING \JOIST SH OE AND ANCHOR.

SPECIFICATION forming part of Letters Patent N0. 762,383, dated June 14, 1904.

Application filed N vem 30, 1903. Serial No. 183,140. (No model.) 7

1'0 a, whom, it may concern:

Beit known that I, ALFRED CARLsoN, acitizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Self-Releasing ings, and has for its object to provide a sim ple, durable, and eflective structural forma tion of a combined anchor and shoe which affords a substantial abutment for the joist end and which in the case of fire or an overloading of the floor will permit the joists end to draw out of the shoe without liability to pulling over the wall of the building, all as will hereinafter more fully appear and be more particularly pointed out in the claim.

In the accompanying drawings, illustrative of the present invention, Figure 1 is-a sectional elevation illustrating the present combined joist shoe and anchor in position in the wall with the end portion of a joist or beam in place. Fig. 2 is a plan View of the shoe and anchor in a detached position. Fig. 3 is a perspective view of the same.

Similar numerals of reference indicate-like parts in the different views.

Referring to the drawings, 1 represents the present combined joist shoe and anchor formed of sheet metal and having a flat bottom portion 2 and sides 3 in separated relation and at right angles to the bottom portion to form a receiving-chamber for the end of the joist 4, as illustrated in Fig. 1.

In the preferred form of the present invention the sides 3 of the shoe will be of a triangular form and having the greatest height at their outer ends, the purpose being to afford strength to the shoe with a minimum weight in the same, as well as to afford a construction which can be very conveniently built into the wall 5 of the building.

., 6 is an angular lip formed integrally on the inner side of the bottom plate 2 of the shoe and adapted to form an anchor therefor by engaging in an interstice between the bricks in the wall 5.

7 represents one or more holes in the bottom plate 2 near its outer end and adapted to receive nails or spikes driven into the under side of the joist 4 to secure the same to the shoe. With such construction while the joist maintains its horizontal position it will be socurely attached to the shoe; but with a breakage of the joist in the middle due to a con flagration in the building and with the sinking of the joists the same will pull away from the shoe and the attaching nails or spikes aforesaid.

Having thus fully described my said invention, What I claim as new, and desire to secure by Letters Patent, is-

As an improved article of manufacture, a joist-shoe formed from a single piece of plate metal, and comprising a flat bottom portion having nail holes near its forward end, a downturned flange at-the rear end of the bot- 7 tom portion constituting an anchoring means for the shoe, and flat vertical portions at the sides of the bottom portion, each vertical portion having a triangular form which slopes from the forward to the rear end of the shoe,

for the purpose set forth.

Signed at Chicago, Illinois, this 25th day of November, 1903.

ALFRED CARLSON. Witnesses:

ROBERT BURNS, M. H. HOLMES. 

